Except the micro controller, the micro controller application includes the low level sensor signal and the suitable power source driving circuit frequently, needs to design the power source and the earth carefully. This article will discuss the noise source and the noise path of propagation. We will involve behind the good layout custom the theory and to the noise the influence. We will also discuss isolate and limit the noise part’s suitable choice and the layout method.
The system block diagram which Figure 1 is in this article discusses when uses. This system’s function is gathers the weight and demonstrates the result in the LED array and on the notebook. When need, may use the ventilator controller to the circuit wafer temperature decrease.
This design example has included the simulation and the digital two parts. Is one of how this kind of design’s difficult these two modified quarantines. Looked first this design’s simulation part, the simulator input enters the electric circuit to realize the weighing. Figure 1 analogue interface electric circuit including the weighing, increases the electric circuit, the breast frequency filter and 12 modulus switches (ADC). What the weighing uses is Hui Si the electric bridge, as shown in Figure 2.
